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/* $OpenBSD: mailwrapper.c,v 1.6 1999/12/17 05:06:28 mickey Exp $ */
/* $NetBSD: mailwrapper.c,v 1.3 1999/05/29 18:18:15 christos Exp $ */
/* $FreeBSD$ */
/*
* Copyright (c) 1998
* Perry E. Metzger. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed for the NetBSD Project
* by Perry E. Metzger.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <libutil.h>
#include <syslog.h>
#include <stdarg.h>
#include "pathnames.h"
struct arglist {
size_t argc, maxc;
char **argv;
};
int main __P((int, char *[], char *[]));
static void initarg __P((struct arglist *));
static void addarg __P((struct arglist *, const char *, int));
static void freearg __P((struct arglist *, int));
extern const char *__progname; /* from crt0.o */
static void
initarg(al)
struct arglist *al;
{
al->argc = 0;
al->maxc = 10;
if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL)
err(1, NULL);
}
static void
addarg(al, arg, copy)
struct arglist *al;
const char *arg;
int copy;
{
char **argv2;
if (al->argc == al->maxc) {
al->maxc <<= 1;
if ((argv2 = realloc(al->argv,
al->maxc * sizeof(char *))) == NULL) {
if (al->argv)
free(al->argv);
al->argv = NULL;
err(1, NULL);
} else {
al->argv = argv2;
}
}
if (copy) {
if ((al->argv[al->argc++] = strdup(arg)) == NULL)
err(1, NULL);
} else
al->argv[al->argc++] = (char *)arg;
}
static void
freearg(al, copy)
struct arglist *al;
int copy;
{
size_t i;
if (copy)
for (i = 0; i < al->argc; i++)
free(al->argv[i]);
free(al->argv);
}
int
main(argc, argv, envp)
int argc;
char *argv[];
char *envp[];
{
FILE *config;
char *line, *cp, *from, *to, *ap;
size_t len, lineno = 0;
struct arglist al;
initarg(&al);
for (len = 0; len < argc; len++)
addarg(&al, argv[len], 0);
if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
addarg(&al, NULL, 0);
openlog("mailwrapper", LOG_PID, LOG_MAIL);
syslog(LOG_INFO, "can't open %s, using %s as default MTA",
_PATH_MAILERCONF, _PATH_DEFAULTMTA);
closelog();
execve(_PATH_DEFAULTMTA, al.argv, envp);
freearg(&al, 0);
err(1, "execing %s", _PATH_DEFAULTMTA);
/*NOTREACHED*/
}
for (;;) {
if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
if (feof(config))
errx(1, "no mapping in %s", _PATH_MAILERCONF);
err(1, "can't parse line %lu", (u_long)lineno);
}
#define WS " \t\n"
cp = line;
cp += strspn(cp, WS);
if (cp[0] == '\0') {
/* empty line */
free(line);
continue;
}
if ((from = strsep(&cp, WS)) == NULL)
goto parse_error;
cp += strspn(cp, WS);
if ((to = strsep(&cp, WS)) == NULL)
goto parse_error;
if (strcmp(from, __progname) == 0) {
for (ap = strsep(&cp, WS); ap != NULL;
ap = strsep(&cp, WS))
if (*ap)
addarg(&al, ap, 0);
break;
}
free(line);
}
(void)fclose(config);
addarg(&al, NULL, 0);
execve(to, al.argv, envp);
freearg(&al, 0);
warn("execing %s", to);
free(line);
exit(1);
/*NOTREACHED*/
parse_error:
freearg(&al, 0);
free(line);
errx(1, "parse error in %s at line %lu",
_PATH_MAILERCONF, (u_long)lineno);
/*NOTREACHED*/
}
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